Perpetual calendar.



N. MOHLIN.

PERPBTUAL CALENDAR.

APFLIOATION FILED 11:13.12, 1912.

Z SHEBTB-BHEET 1.

j-lifi-3 2 PERPETUAL CALENDAR PERPETUAL GALENDHR YEAR To |0000 FROM YER |755 TO |0000 YEARS nquncs unosnaconeu me LEAP `mms FIRST TN FIRST TWO nimm an: 1 7

F nasi wooo ooo DESIRE a r v cuLuMnlA PLANOURAPH CD..WASHINATDN. D. v:`

N. MOHLIN.

PBRPETDAL DALENDAR.

APPLICATION FILED FEB. 12, 1912.

1,066,642. Patented July 8,1913.

2 SHEETS-SHEET 2. j. Y

m-woqomol-D AND .MoN TuEs WED THUR FRI 51mm ,Z5 MONJUES WED THDR Fm DATURSDN *MEST-ff: TDESWED THuR FRI SATDRSDN MoN T :1r-:1i WEDTHDR FRI sATuR su Mou Tuan THUR FRI sATuRsuN MoN TuEs WED 1 "1m-f1.; FRI. 5mm SDN MoN TuEs WED THUR SHTUSUN MON TUES WED THUR FRI ihm-J;

commun. PLMMRAPH C0., wAsmNCITON, D. c.

UNET :1D

NILS MOI-ILIN, OF CHICAGO, ILLINOIS.

PERPETUAL CALENDAR.

Specification of Letters Patent.

Patented July 8, 1913.

Application filed February l2. 1912. Serial No. 677,131.

To all wim/m 'i 1f may concern,

Be it known that I, NiLs MOULIN, a citizen of the United States, and a resident ot' the city oit Chicago, in the county ot' (look and Sta te of Illinois, have invented certain new and useful lnipr()vements` in Perpetual Calendars; and l do hereby declare that the :following a Yfull, clear, and exact description ot' the same, reference being had to the accompanying drawings, and to the numbers of reference marked thereon, which form a part of this specification.

The object of the invention is to attord a calendar in compact and simple form. by

means of which the calendar for any month ot any year vli'or any number of years dosired, may be quickly and accurately si lected.

lt is also an object of the invention to al'lford a construction whereby the alendar selection and determination, is mechanically effected and without computation on the part of the operator.

lt is also an object of the invention to allord a calendar' card ol the class described adapted to be constructed at a low price and adapted for general use.

The invention also has 'for an object the construction adapted' to ait'tord an instruc tive and desirable novelty.

The invention in a preferred form, is illus trated in the drawings and hereinafter more fully described.

In the drawings: Figure il is a tace view of a device embodying my invention. Fig. 2 is a similar face view, showing a di'li'erent adjustment. Fig. 3 is an enlarged 't'ace view of the movable or finding elements oi the calendar. Fig. l is an end elevation ot the calendar.

As shown in the drawings: the calendar comprisesI an upper, outer 'face card l, such as shown in Figs. l, 2 and 5l, which (1n the calendar illustrated) is intended to show all the vears trom the year 17553 to the year v10,0t), andwhich has marked thereon at the t grouped therein those years less than a een* top thereof tour parallel vertical columns or spaces, having arranged therein respeci tively the first two figures or the ligure indicating the hundred number o'lI the century. 'lhe numbers in said respective groups are so arranged, that the century leap years or those in which the century numbers are divisible by -i-l, fall in the tirst group indicated by Q. lnasmuch as each o'l said century leap years begin on the same day of the week, all the remaining even number centuries are arranged in the third column, indicated by 3, inasnuiich as the First day o'l each ot said centuries falls on the same day ol:h the week. The odd numbered centuries are arranged in two groups alternating the even number groups, and ol these, the odd century numbers arranged in the second groin) or colunm et, are those upon which the first day of each ot' said centuries 'lalls on the Same day ol the week. The remaining odd century numbers are placed in the last column marked 1'). 'lhesx are the odd century numbers which begin all on the lsame day o'l thc I week.

ln a similar manner the table marked B is arranged in columns, in this instance there being seven, one for each day in the week. ln the first ot these columns indicated by G, are arranged the tens and units nun'lbers ot' all those years ol. which the first day o't' the year :lall on the same days 'for all the centuries of the first. group-l ior instance, lVednesday lor the lirst group oli' centuries indicated b v Q; Vtonday t'or the group ot centuries indicated by ll; Saturday for the group oilE centuries indicated by 3;

Thursday for the group ol centilries indil cated by 5; and, inasmuch as the years not leap years have the same calendar ["or .Tannary and October, said column has inarked at the head thereo'l the words .lan. and the number ot days in the month, and Oct. and the number of days in that month. ln a similar manner, all the years in the group marked 7, which begin on the Same days ot the week for the respective groups of centuries, but upon dillferent days than those 'for the remaining columns, and inasmuch as February, March, and November have substantially the same calendar 'for years other than leap year, said months with the number of days in cach. are indicated at the head oit' said column. ln a similar manner, the third column indicated by 8, contains tury, in all o'l which the year begins on the same day of the week lor each group ol centuries, and at the head ol said third col umn indicated by S, are indicated the months of April, July and January when the year selected is a leap year. ln a similar manner, each ot the remaining seven columns indicated by 9, 10, 11 and 12, is appropriated to those years less than a century in Which the first day of January falls on the same day of the Weel; invariably.

Printed at the bottom of the card directly beneath the Table B, is the calendar for one month, indicated by 13, the consecutively arranged day numbers for which begin at the top at the upper left corner, and read transversely to afford in each horizontal line all the days of a Week. Said front card 1, is provided With a circular aperture Centrally positioned at the head of each century column or space and a similar circular aperture at the head of each of the year colulnns, '6 to 12 inclusive. A transverse slot is provided through said card or plate of length transversely the card equal to the Width of the calendar and of a Width corresponding approximately With the Width of one of the day number spaces in said calenA dar. Said front or face card is rigidly secured at its ends and edges to a back sheet or card 14, as indicated in Fig. 5, and a central finger notch is provided at the lower or bottom ends of said cards.

Slidably engaged in the slide pocket between the front face and back card, is a finde ing card 15, provided at its lower end with an extension or tab 16, which projects outwardly through the finger notches at the lower end of said front face and back card, as shown. in Figs. 1 and 2. Arranged or said finding card near the bottom thereof, and corresponding in position With the cal-- endar 13, on the front face card, is a Weel; calendar 13a upon which, in succession, is marked the seven possible arrangements for the first Weel; of each month-that is to say, the names of the days or the abbreviations thereof are arranged transversely the card in the columns corresponding With the day numbers in the calendar 13, shown on the front face card, so that, with the upper line of the Week calendar 13a, exposed to the slot at the head of the calendar, it would indicate that the first day of the particular month for which the calendar then Was adjusted,fell upon Sunday. In a similar manner. the next succeeding lines of Week-days begin successively with Monday, With Tues day` with Wednesday, With Thursday, with Friday, and With Saturday, thereby enabling the correct calendar for any month to be indicated on the calendar 13, by shifting the card 15, to bring the Week calendar 13EL into proper position for the appropriate Week arrangement to show through said slot above the month calendar.

Arranged at the top of the card above each of the century columns, are characters or figures 2a, 8a, et* and 5a, respectively adapted to be seen through the aperture at the head of each century column to indicate the correct century adjustment for the January or October calendar for the century of the particular group of centuries for which each of said indicators is in alinement. These indicators or characters may be any fanciful figure. As shown, they are mere circles of a distinguishing color of approximately the' visible through its aperture, that is to say,

With the adjustment shown in Fig. 2, With the moon or indicator 2, appearing in View at the aperture above the first century col` umn, the calendar is correctly adjusted for January and October of any of the years appearing in the first, or the column indicated by 6, in Table B, excepting those under-- scored, lWhich are leap years. It is correctlyA positioned for any of the months at th'c head of column 2, for any year of the same group of centuries in said column, except the underscored, which are leap years, and in the same manner, the said calendar is correctly arranged for the years in any of said columns and the particular month Written at the head of the column in Which the year appears. Of course, said moons or indicators are arranged at the top of the card to afford t-he desired shift of the Week calendar to adjust the appropriate Week calendar into view above the month day calendar. For this purpose, inasmuch as all the leapV year centuries in the first column 2, begin on the same day, as shown in Fig. 2, said moon 2n. is so placed on the card that when the card is adjusted to bring said indicator in register with the aperture at the head of said column, the Week calendar beginning with Wednesday for February, March and November in column 7, of Table B, appears in the slot above the month calendar. This ad justment indicates that February. March and November for any of the years in group 2, of centuries marked in column 7, of Table B, also have the same calendar for February, March and November. In asimilar manner the indicator or moon 11, for the odd century column 4, is arranged above the moon y for the first column, so that When the finding card 15, is drawn downwardly to bring said moon in register With the aperture in the odd century column 4, the month calling for January and October for all the years for said edd centuries Written in column 6, of Table B, begins on .Monday The same calendar is used for the months of February, March and Novemberfor all the years of said centuries marked in the column 7, for April, July and January, when a leap year for all the years in said century marked in column 8, for May for the years in said century marked in column 9, tor June for all the years ot said centuries marked in column 10, for August and February when a leap year t'or all the years of said centuries marked in column 11, for September and December for all the years et said centuries marked in column 12. In a similar manner, as shown in Fig. l, when the moon or indicator' 3, is shown in the aperture in the even century colunm 3, the calendar is adjusted as before described to indicate all the respective months of any of the years ot' the centuries included in said column il, upon which the first day of the month :falls upon Saturday, and in a similar manner, when adjusted so that the moon 5, shows at the apertm'e in odd century column 5, the calendar is adjusted so that all the mouths ot' the yvars oi. the centuries shown in column 5, upon which the first day oit the month is lhursday, are indicated. Means are also provided tor adjusting the timling card to show the calendar for any month of any one of said years after the first adjustment thereof. For this purpose, the respective week calendars are indicated by numbers B, upon the card l5, back of the Table B, and referring to Figs. 2 and 4, it will be seen that with the moon appearing above column or space 2, for leap year centuries, the numerals 7, 4, l, (S, 3, 5, and Q may be read through the apertures above the respective columns in Table B, and that the calendar is so adjusted as to indicate that the month began with Vednesday for any of the years and months indicated in the respective columns of Table B.

Each of the numbers appearing at the aperture at the head oit the respective columns in Table I3, is a finding number Afor the century above which the moon appears, and for the particular year above which the number appears. For example, the first day ot' January for the year 2003 will fall on Vedncsday and the significant digit or linding number 7, appears at the head of column 3, in Table B, in which the year 1903 for said century is written. Should February, March, or November of said year be required, the finding card is pushed upwardly by means oil' its tab until the finding number 7 appears beneath the aperture for the months February, March and November written at the head of the column S, in Table F). Each of said three months for said year begin on Saturday. ln consequence, the second row or column of finding nunierals B reads from the top downwardly from 'l to 7 consecutively. Each ot' said significant digits indicate, when exposed at the View apertures at tht` head oil said eolmnns, that the cfnresponding week calendar is exposed above the month calendar. Should the months oit' April or July be required for said year or any of the. years found in column 0, olE Table l, the finding card is adjusted until the finding digit 7, appears at the head oit said column. inasmuch as said months begin on l`uesday for lsaid year, the third week calendar is required, hence the finding numbers B', number from the top downwardly :from l to 7 inclusive, and then 'from 1 to 41` inclusive, as shown in Fig. 4^. Should the month ot May be required Alor said year, or any year -found in the leap year century column, Table 4e, 'lable A, or B, the finding card is again adjusted until Table 7 appears in the View aperture et the required month, inasmuch as the month olf May For all said years begins on rThursday, the arrangement of the numerals in the fourth column ot finding numbers shown on Fig. 1l, reads downwardly from 3 to 7 inclusive, and thence downwardly trom 1 and 2, progressively should June be required, inasmuch as the month ot' June for any and all oi said years mentioned begin on Sunday, the fiith column ot finding digits begins at the top with the digit 7, which indicates the upper week calendar shown on Fig. 1i, and thence read downwardly from Il to t3 inclusive, and .horizontally should August or lllebruary (when a leap-year be required tor any of said years, the finding digit 7, is adjusted Ato appear beneath said months in column l1, of 'lable B, thereby adjusting the week calendar to indicate that the months in question began upon Friday, and correspondingly the finding digits in said column 0, shown ou Fig. l, read :from to 7 inclusive, dmvruvardly, the digit il, coming last, and in arranging 'for September and December of any oit. said years, said months begin on Monday, consequently the second week :alendar from the top is required, hence in the seventh and last column the .finding numerals ll', (if the figures arc arranged properly) reading lrom the top downwardly, (i and 7, and then l to 5 inclusive.

This somewhat arbitrary arrangement is followed with reference to all the various groupings o't years indicated in the respective columns, so that having adjusted the finding card to show in th, aperture for the century number the significant digitshowing in the ajvierture above that column in Table B, in which the tens and unitsI oit the year are written, may be used as a key num ber in finding the calendar for any required month in the year selected. For example, assuming the month oi February tor the year 1800, to be required, inasmuch as the century number 1S, appears in column 3, of Table the finding card is adjusted until the moon or indicator Il, shows in the apertilrc at the head oi` said group or column. .Ihe remaining two figures oi the year, to wit 09 appear in colunm tu. The

finding number shown at the head of the column with such adjustment is et, as shown in Fig. 1, and the calendar is now adjusted to indicate that April and July of said year begin on Saturday, said week calendar being the bottom week calendar shown on F ig. 4t, and consequently the digit 4, in the third column of nding figures, is at the bottom of the column. In the second column, however, said digit is the fourth gure from the top, inasmuch as February, March and `November of the years in questio-n begin with /Vednesday. Variation from these dates are occasioned only by leap-year, and in the months of January and February. ln practice, all leap-year numbers are indicated on the calendar in red ink. For purposes of illustration herein, such leap-year numbers or dates are underscored in the drawings. Leap-year J anuarys are indicated in column 8, of rliable B, and leap-year Februarys are indicated in column 6, of 'lable B. For example, in adjusting the calendar for 1912, the moon 5a, appears at the lapertures in the column 5, rfable A, inasmuch as the century numbers are found therein. The remaining numbers, 12, the tens and units for the year, are found in column 11, ot Table B, and are shown underlined in thel drawii'igs to show that the year is leap-year. Leap-year February also occurs in column 11, consequently the first adjustment of the calendar indicates that the month for February and August for 1912, begin with Thursday. January of said year began with Monday, adjusting the nding figure G, to column 8, containing leapyear January, and whichl appears as t-he second iinding figure from the top in the third finding column indicated in Fig. 4t, the weelr calendar correctly adjusted to show that the lirst day of January of 1912, was Monday as will also be the first day of April and July.

Printed or marked at the bottom of the card on each side the card, are the following words at the left Dz'recom-Find first two figures of year in Table Kilt. dove slide until moon appears in said division. Find second two figures of' year in Table B l. 1n hole above same column note figure. lifove slide until noted figure appears in hole under month desired. Calendar shows month desired.

rind on the right the followings words Ewa/7727926.-lVanted: Month of Feb. 1809. Find 18 in rllable Za. Move slide until moon appears 18. Find 09 in rlable B. 1n hole above saine column note t. Move slide until appears under the month of Feb. Calendar shows month of Feb. 1809.

Oi .necessity the operation has been fully described in the foregoing specieation. lt is, of course, to be understood that in the same manner a calendar for any desired number oi years may be constructed. 1 have, for convenience, however, and to economize space, indicated a calendar from 1700 to 10,000.

Vi/Thile l have preferred to use significant digits in lieu of dominical letters as the tinding` numbers for the calendars for the various numbers, it is to be understood, of course, that the calendar numbers from A to G inclusive may be substituted therefor. Of course, details of construction may be varied, and it' desired, the bac-lt of the calendar may have printed thereon the usual directions to permit the calendar to be made of the proper size to be used as a postcard.

l do not purpose limiting the patent. to be granted on this application otherwise than necessitated by the prior art.

l claim as my invention:

l. it calendar of the class described comprising an apertured envelop, a table thereon comprising the century numbers, a second table comprising the year numbers,'a third table comprising ainonth otm thirty one days, and a member slidable in said envelop comprising a table of the numerals 1 to 7 arranged in proper sequence in seven different columns, a table ot the week days arranged in sequence in columns reading both horii/.ontally and vertically, and ai table of indicating characters to enable the operator to bring the proper numerals and `days into register' at the apertur-es in the envelop for the dates desired.

2. A. calendar embracing a front face card having the centuries arranged in groups in accordance with the day of the week upon which the respective centuries begin, an aperture above each group, a table ot years arranged beneath the same and divided into seven columns, with reference to the domini cal letters of' the respective years, said card having an aperture therethrough above each column, a month calendar below the last named table, a slot opening through the card above the calendar, a findingl card slidable beneath the face card and having indicating marks thereon to register with the apertures for the century groups, a week calendar adapted to register with the slot above the month calendar, and an arrangement of dominical letters or characters for registering with the apertures in the respective year cohnnns to indicate the position for shifting the weelr calendar' to indicate any required month in any required year.

3. A. perpetual calendar comprising an apertured envelop, a plurality of tables thereon, one containing centuries, one containing the tens and units of the centuries, and another containing the numerals of a month calendar, a member slidable within said envelop, a plurality of nding'groups thereon, one containing indications for the century fables, another containing' indications for scribed my nume in the presenee of two the seid tens and units table, and e zgroup of subscribing' witnesses. progressively arranged week days, .said groups on seid sldable member adapted to indicate the respective year and oentury 'for Witnesses: :my month respectively. Cumbres W. HILLS, Jr.,

In testimony whereof I have hereunto Sub- GEORGE R. Moolen.

NILS MOHL'lN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .'D. C. 

